Tertiary air addition to solid waste-fired furnaces for nox control

A secondary air and combustion furnace technology, applied in the direction of combustion air/fuel supply, combustion type, combustion equipment, etc., can solve the problems of high capital cost and high cost

Active Publication Date: 2010-03-17
COVANTA ENERGY CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of waste disposal expense and cost effectiveness, the cost of SCR is generally higher due to high capital expenses, and the cost of catalyst replacement and disposal

Method used

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  • Tertiary air addition to solid waste-fired furnaces for nox control
  • Tertiary air addition to solid waste-fired furnaces for nox control
  • Tertiary air addition to solid waste-fired furnaces for nox control

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Embodiment Construction

[0029] now refer to figure 1 , in one embodiment of the present invention, the solid waste combustion system 100 utilizes a moving grate 110 having three primary sources of combustion air. Primary air 10 is introduced below the grate 110 and flows upwards through the bed of combustion waste 20 . Secondary air 30 is introduced through one or more rows of secondary nozzles 120 above the bed of combustion waste 20 . In a typical MWC, secondary air 30 is used to vigorously mix the combustion gases by adding additional oxygen and providing turbulence to complete the combustion of VOCs and carbon monoxide as quickly as possible. In the present invention, secondary air plays a different role. Secondary air is injected at a low rate to minimize mixing and combustion. The role of the secondary air is to promote the concentration of the flame in the furnace and to create a cooler air blanket along the wall, thereby reducing the effect of higher furnace temperatures on the materials ...

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Abstract

Through the addition of tertiary air and a reduction of secondary air, NOx emissions from a waste-to-energy (WTE) boiler may be reduced. The tertiary air is added to the WTE at a distance from the secondary air, in a boiler region of relatively lower temperatures. A secondary NOx reduction system, such as a selective non-catalytic reduction (SNCR) system using ammonia or urea, may also be added to the boiler with tertiary air to achieve desirable high levels of NOx reductions. The SNCR additives are introduced to the WTE boiler proximate to the tertiary air.

Description

[0001] Cross References to Related Applications [0002] Pursuant to 35 U.S.C. §119(e), this application claims the benefits of U.S. Provisional Patent Application No. 60 / 876,573, filed December 22, 2006, and U.S. Provisional Patent Application No. 60 / 907,956, filed April 24, 2007. Priority, and related to US Patent Application No. 11 / 905,809, filed October 4, 2007, the subject matter of which is incorporated by reference into this application. technical field [0003] The present invention relates to the reduction of NO produced from waste-to-energy boilers by adding tertiary air and reducing secondary air X method of emissions. Embodiments of the method can also incorporate secondary NO X Reduction systems, such as simple selective non-catalytic reduction (SNCR) systems using ammonia or urea, to achieve the desired high levels of NO X reduction. Background technique [0004] Combustion of solid waste in a municipal waste burner (MWC) produces a certain amount of NO X ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56
CPCF23G2202/101B01D53/56B01D2251/2062F23L1/02F23J2219/20F23G5/245B01D2251/11F23L9/02F23G5/50B01D2251/2067
Inventor S·P·高夫M·L·怀特S·G·德杜克J·D·克拉克C·A·布拉德利R·L·巴克尔Z·塞马尼辛
Owner COVANTA ENERGY CORPORATION
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